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For Expiry Canary 1.0Publisher's description

Expiry Canary is a Browser software developed by gerv. After our trial and test, the software is proved to be official, secure and free. Here is the official description for Expiry Canary:

Expiry Canary will tell you if the certificate of the website you are visiting is about to expire. By Default it gives 7 days Warning for all sites, but you can configure the warning period and the sites it works on. It is expected to be useful to admins who want a backstop to their certificate renewal procedure, to Prevent embarrassing accidents.

You can use the preference "extensions.canary.warningPeriod" to change the warning period in days (default 7), and set "extensions.canary.sites" to a space-separated list of sites or domains to restrict Expiry Canary to warning you on those sites only. you can free download Expiry Canary 1.0 now.